The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 2017
Filed:
Mar. 14, 2014
Nihonkagakusangyo Co., Ltd., Tokyo, JP;
NIHONKAGAKUSANGYO CO., LTD., Tokyo, JP;
Abstract
In a treatment process for a positive electrode active material for a lithium-ion secondary battery, Li compounds such as LiCO, LiOH, and the like, present in a positive electrode active material for a lithium-ion secondary battery but unsuitable for a positive electrode material, is removed. In a case wherein the resultant Li compound is used as a positive electrode material of the secondary battery, a discharge capacity and an average discharge voltage of the secondary battery do not decline, and gelation caused by a cleaning treatment is prevented. The positive electrode active material is cleaned with a cleaning fluid containing NH, and then solid-liquid separation is performed, and a solid component is calcined at 600 to 700° C. in an oxygen atmosphere. The cleaning fluid has a conductivity of 11.6 mS/cm or less, and contains a recovered liquid component and may be repeatedly used as a cleaning fluid.